{2025.06}[2024a] Visit 3.4.2 (WIP)

[boegel]

draft PR, since there's a problem when building this on top of EESSI, probably because we filter out zlib as dependency:

CMake Error at CMake/FindZlib.cmake:63 (message):
  VisIt requires lib z and it could not be found.
Call Stack (most recent call first):
  CMake/SetUpThirdParty.cmake:561 (include)
  CMakeLists.txt:521 (include)